If global warming manages to melt the polar ice caps any time soon, you'd better be really comfortable riding the waves. Train your sea legs on the open water with today's deal from All Points of Sail: For $85, hang ten with a windsurfing lesson, during which you may master large or small boards as you surf Clear Lake (a $175 value). Or for the same price, enjoy a five-hour Sunfish sailing course (regularly $175). Unfurl your sail at Lakeside Marina in Seabrook when you take to the Lake in the nearly 14-foot Sunfish rig and learn everything from nautical lingo to safety maneuvers with the help of your professional instructor. Whichever option you choose, you'll earn your sailing certificate and spend part of the course rigging and de-rigging the Sunfish and windsurfing boards. Then you'll load your board for a five-minute drive to the class site, where you'll be in for smooth sailing amid a sea of change. Want more? Check out All Points of Sail on Facebook.